change the default datasetColumnName to 'dataset'

[TaiSakuma]

at either

• alphatwirl/alphatwirl/collector/ToTupleListWithDatasetColumn.py

  Line 6 in 705bcce

  datasetColumnName='component'

  
  and

• alphatwirl/alphatwirl/collector/ToDataFrameWithDatasetColumn.py

  Line 10 in 705bcce

  datasetColumnName = 'component'

  
  or

• alphatwirl/alphatwirl/configure/build_counter_collector_pair.py

  Lines 27 to 29 in 705bcce

  	resultsCombinationMethod = ToTupleListWithDatasetColumn(
  	summaryColumnNames = tblcfg['keyOutColumnNames'] + tblcfg['valOutColumnNames']
  	)

• build_counter_collector_pair can become a class so that datasetColumnName can be changed by an option to __init__().